Environment

• Dubbo version: dubbo-registry-nacos 2.7.6
• Operating System version: Win10
• Java version: JAVA 8

Steps to reproduce this issue

1 springboot yml配置如下：
registry:
address: nacos://127.0.0.1:8848
simplified: true
group: dubbo-local
metadata-report:
address: nacos://127.0.0.1:8848
group: dubbo-local

2 登陆nacos 1.2.1 控制台发现元数据 group配置生效，但是服务管理下的group依旧是DEFAULT_GROUP。

3 跟了下dubbo-registry-nacos 2.7.6的代码 发现在调用NamingService中 没有传入配置的group参数，使用的默认组参数
public void doRegister(URL url) {
String serviceName = this.getServiceName(url);
Instance instance = this.createInstance(url);
this.execute((namingService) -> {
namingService.registerInstance(serviceName, instance);
});
}

Pls. provide [GitHub address] to reproduce this issue.

Expected Result

What do you expected from the above steps？

Actual Result

What actually happens?

If there is an exception, please attach the exception trace:

Just put your stack trace here!